new system for beginner

i am not terribly familar with hi quality stereo equipment. i am looking to build my first system though. i am mostly interested in buying used quality equipment. i do not have a lot of room to fill and i only listen to cds. i am wondering what the good brands are to with. speakers are the area of most concern and i haveno idea what to look for. if this is too novice of a thread i understand. my knowledge is limited and i have to start somewhere. thanks for any help.